MKV to MP4 Video Converter
Convert video formats online for free. 100% browser-side, no upload needed.
Drop video files here or click to browse
MP4, WebM, AVI, MOV, MKV β up to 500MB each
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Frequently Asked Questions
Is VideoTools really free?
Yes, completely free. No hidden fees, no premium tiers, no signup required. All tools run entirely in your browser.
Are my videos uploaded to a server?
No. All processing happens in your browser using FFmpeg WASM. Your files never leave your device. We have zero access to your data.
Will converting reduce my video quality?
Re-encoding always involves some quality loss, but you can control the quality level. Higher quality settings produce results nearly indistinguishable from the original.
What video formats are supported?
We support MP4, WebM, AVI, MOV, MKV, FLV, WMV, 3GP for input, and MP4, WebM, AVI, MOV, MKV for output. GIF and audio formats (MP3, WAV, OGG, FLAC) are also supported for specific tools.
What is the maximum file size?
There is no hard limit set by us. However, your browser needs enough RAM to hold the file. Most modern devices handle files up to 500MB comfortably. Very large files (2GB+) may cause browser memory issues.